diff --git a/phases/linear-static-3d-euler-beam/index.json b/phases/linear-static-3d-euler-beam/index.json
index f7d132a..1ad7eb9 100644
--- a/phases/linear-static-3d-euler-beam/index.json
+++ b/phases/linear-static-3d-euler-beam/index.json
@@ -37,7 +37,10 @@
     {
       "step": 4,
       "name": "io-contract",
-      "status": "pending"
+      "status": "completed",
+      "started_at": "2026-08-09T02:52:47+0900",
+      "summary": "승인된 Abaqus B33 keyword subset, stable source identity, HDF5 schema v0와 legacy CSV normalization/component-scale tolerance 계약을 정의함",
+      "completed_at": "2026-08-09T03:16:25+0900"
     },
     {
       "step": 5,